java web 项目HTTP：500错误_java吧

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java web 项目HTTP：500错误

HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /recordList.jsp at line 52
49: </Tr>
50: <%
51: recordPO record;
52: for (int index=0;index<Record.size();index++){
53: record=Record.get(index);
54: %>
55: <tr onclick="choose('<%=index+1%>')">
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
controller.ApplicationControllerServlet.service(ApplicationControllerServlet.java:31)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NullPointerException
org.apache.jsp.recordList_jsp._jspService(recordList_jsp.java:109)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
controller.ApplicationControllerServlet.service(ApplicationControllerServlet.java:31)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.

送TA礼物

1楼2016-06-02 17:22回复

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@page import="javabean.recordPO"%>
<%@page import="java.util.List"%>
<%
request.setCharacterEncoding("gbk");
@SuppressWarnings("unchecked")List<recordPO> Record=( List<recordPO>)request.getAttribute("record");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script language="javascript">
function choose(number){
var rowNo = eval(number);
document.forwarder("name").value = document.all("listTable").rows[rowNo].cells[0].innerText;
document.forwarder("no").value = document.all("listTable").rows[rowNo].cells[1].innerText;
document.forwarder("credit").value = document.all("listTable").rows[rowNo].cells[2].innerText;
document.forwarder("booknumber").value = document.all("listTable").rows[rowNo].cells[3].innerText;
document.forwarder("bookname").value = document.all("listTable").rows[rowNo].cells[4].innerText;
if (document.all("listTable").rows.length>1) {
for (var i=1; i<document.all("listTable").rows.length; i++){
document.all("listTable").rows[i].style.backgroundColor="";
}
}
document.all("listTable").rows[rowNo].style.backgroundColor="#ff998f";
}
function gotoAdd(){
document.forwarder.action="RecordAdd.jsp";
document.forwarder.submit();
}
function gotoUpdate(){
document.forwarder.action="RecordUpdate.jsp";
document.forwarder.submit();
}
function gotoDelete(){
document.forwarder.action="RecordDelete.jsp";
document.forwarder.submit();
}
function gotoPortal(){
document.location.href ="/Library management system/portal.jsp";
}
</script>
</head>
<body>
<Table id="listTable">
<Tr>
<td>读者姓名</td><td>记录序号</td><td>读者编号</td><td>图书编号</td><td>图书名称</td>
</Tr>
<%
recordPO record;
for (int index = 0; index < Record.size(); index++){
record=Record.get(index);
%>
<tr onclick="choose('<%=index+1%>')" align="center">
<td><%=record.getName()%></td>
<td><%=record.getNo()%></td>
<td><%=record.getCredit()%></td>
<td><%=record.getbooknumber()%></td>
<td><%=record.getbookname()%></td>
</tr>
<%} %>
</Table>
<p>
<input type="button" name="add" value="新增" onclick="gotoAdd()">
<input type="button" name="edit" value="修改" onclick="gotoUpdate()">
<input type="button" name="delete" value="删除" onclick="gotoDelete()">
<input type="button" name="exit" value="退回门户" onclick="gotoPortal()">
</p>
<form method="post" name="forwarder" id="forwarder">
<input type=hidden name="name" id="name" />
<input type=hidden name="no" id="no" />
<input type=hidden name="credit" id="credit" />
<input type=hidden name="booknumber" id="booknumber" />
<input type=hidden name="bookname" id="bookname" />
</form>
</body>
</html>

来自iPhone客户端2楼2016-06-02 17:26

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